Vehicle window cleaning mechanism



Dec. 3, 1963 M. FORBUSH ETAL 3,1 12,510 VEHICLE wmnow CLEANING MECHANISM Filed Oct. 15, 1962 5 Sheets-Shet 1 INVENTORS LOTHROF' T1. FORBUSH GILBERT H. WOLF KEITH E. W OD M55241) THEIR ATTORNEY Dec. 3, 1963 L. m. FORBUSH ETAL 3,112,510

VEHICLE WINDOW CLEANING MECHANISM 5 Sheets-Sheet 2 Filed Oct. 15, 1962 INVENTORS LOTHBOP 1. FORBUSH 1 GILBERT H. WOLF KEITH E. WOOD BY THEIR ATTORNEY Dec. 3, 1963 L. M. FORBUSH ETAL. 3,112,510

VEHICLE WINDOW CLEANING MECHANISM 5 Sheets-Shet 3 Filed Oct. 15, 1962 INVENTORS L THBOP r1. FORBUSH GILBERT H. WOLF KEITH E. WO D Y flat 5 man ATTORNEY Dec. 3, 1963 L. M. FORBUSH ETAL 3,112,510

VEHICLE WINDOW CLEANING MECHANISM 5 Sheets-Sheef 4 Filed Oct. 15, 1962 mvENToRs eusmr H. KEITH E.

FOR BUSH WOLF. WOOD LOTH HOP 4% THEIR ATTORNEY Dec. 3, 1963 M. FORBUSH ETAL 3,112,510

VEHICLE wmnow CLEANING MECHANISM 5 Sheets-Sheet 5 Filed Oct. 15, 1962 a Rm wsww fial 5i \w INVENTORfi LOTHROP "1- FORBUSH GILBERT H. wou= KEITH E. WOOD 13y THEIR ATTORNEY Unite States Patent Ofiice 3 E l2,5lfl- Patented Dec. 3, 1963 VEHlCLE WENDGW ULEANENG MECHANl'Sll I Lothrop M. Forhnsh, Birmingham, Gilbert H. Wolf, Milfcrd, and Keith E. Wood, Armada, Mich, assignors to General lvlotors Corporation, Detroit, Mich, a corporation of Delaware Filed Get. 15, 19623, Ser. No. 230,417 14 Claims. (El. l-25ll.tlll) '"his inven ion per aims to vehicle window cleaning systems, and particularly to a cleaning system for a vertically movable tailgate window of a station wagon type vehicle.

it is well recognized that a great quantity of VlSlOIl obscuring material is deposited on substantially vertically disposed tailgate windows of station wagon type vehicles. Since it is desirable that the river have adequate rearward vision at times, the present invention is directed to a cleaning system for movable tailgate windows including a wiper unit and a washer unit capable of conjoint operation to clean an adequate area of a tailgate window, and wherein the wiper blade of the wiper unit 18 automatically moved to a parked position against the upper edge of the tailgate when the tailgate window is lowered.

Accordingly, among our objects are the provision of a rear w ndow cleaning system for vehicles including a washer unit mid a wiper unit capable of conjoint operation; the further provision of a wiper unit for the rear window of a vehicle including means to positively park the wiper do; the further provision of a cleaning system for the movable rear window of a vehicle including means to automatically park the wiper blade and deactivate washer unit when the window is lovcred; the further provision of a system of the aforesai type including an adjustable wiper linkage actuated by the window adjusting mechanism for automatically moving the wiper blade to a depressed parked position when the window is iully lowered; the further provision of a sy' of the aforesaid type including means precluding upward movement or" the wiper blade from its parked position when the tailgate window is fully lowered; and the still further provision of 3621115 for protecting the exposed edge of the tailgate window when it is fully lowered v ith the wiper blade in its parked position in ongagement with the window.

The aforementioned and other objects are accomplished resent invention by util' ing an electric motor a wiper unit and an electric motor driven washer unit, the energi ing circuits of which include a limit switch for recluding operation of both the wiper and was ier unit at all times except when the tailgate window stantially f ly closed. Specifically, two embodia wiper unit are disclosed herein, both embodicluding a movement amplifying transmission so to impart oscillation to the Wiper arm and blade ashroughout an angle of at least 160. in one emo iment, the wiper arm and blade assembly is parked adjacent one of its normal stroke end positions in a sublly horizontal position. In the second embodiment, the wiper arm and blade assembly is positively moved to a depressed parked position beyond its normal stroke end position by an adjustable length linkage operated by the window actuating mechanism when the tailgate window is fully lowered.

Further obiects and advantages of the present invention w ll be apparent from the following desc iption, reference being bad to the accompanying drawings, wherein preferred embodiments of the present invention are clearly shown and wherein similar numerals depict similar parts throughout the several views.

, gate it When the end 2 In the drawings: FIGURE 1 is a fragmentary view in elevation with certain parts broken away, of a vehicle equipped with the rear window cleaning system of this invention.

FIGURE 2 is an electric schematic of the energizing circuit of the wiper unit and the washer uru't.

FIGURE 3 is an enlarged fragmentary view with certain parts broken away, depicting one embodiment of the wiper unit.

FIGURE 4 is an enlarged view, partly in section and partly in elevation, taken along line 4-4?- of FiGURE 3.

FIGURE 5 is a fragmentary sectional view of a wiper blade in the parked position with the tailgate window fully lowered.

FIGURE 6 is an enlarged fragmentary 'view with cer tain parts broken away depicting a Wiper unit constructed according to the second embodiment of the present invention.

7 is an enlarged fragmentary view with certain parts broken away depicting the manner in which the wiper arm and blade assembly is parked with the wiper unit constructed as shown in FlGURE 6.

FIGURE 3 is an enlarged fragmentary sectional view taken along line 8-3 of FIGURE 7.

FIGURE 9 is a sectional view taken along line 9-9 of FIGURE 7.

With particular reference to FIGURE 1, the present invention is directed to a cleaning system for the rear window of station wagon type vehicles having a tailgate id swingable about a horizontal axis on hinges l2 adjacent its lower edge between substantially vertical and horizontal positions. The tailgate ill carries a substan tially vertically disposed movable Window 14 which is shown in the raised position, in full lines, and completely lowered, in phantom lines, in FIGURE 1. The roof it: of the vehicle is supported in part by the rear pillars 28 which include channels for guiding the tailgate window 14 during upward and downward movement thereof when the tailgate is closed. The window opening defined by the roof i6 and the pillars lid may, as shown, have a reveal molding 26? secured to its peripheral edge.

Referring to FlGURE 3, the tailgate window 14- may be provided with a protective metal bead, or rim, 2 along its edges. The fully lowered position of the window M is depicted in phantom lines in FIGURE 3, from which it can be seen that the protective rim 22 along the upper edge of the window projects above the upper edge of the tailgate i The regulator, or actuating, mechanism for raising and lowering the tailgate window 1d comprises a pair of interengaging sector gears and 26 having arms 28 and 36, respectively, attached thereto, the upper ends or" which are slidab'ly disposed in lower sash channel cams 32 secured to the lower frame of the window 14*. 'll c sector gears 24, 26 and arms 28, 3d are movable about pivot shafts 34 and 33, respectively, carried by a bracket ltlattached to an inner panel of the tailgate. As shown, the sector gear 2a is engaged by a pinion gear 2-2. which is driven by a reversible electric motor 44 through a suitable gear eduction unit. To lower the tailgate window 1d the sector gear 26 is rotated in the clockwise direction about its pivot shaft 3%thereby imparting counterclockwise rotation to the sector gear 24. When the tailgate window 14 is in its fully closed position, as depicted in full lines in FIGURE 3, the protruding end 46 of the sector gear 26 engages a plunger 48 of a limit switch 5i disposed between the inner end and o ter walls of the tail- 46 of the sector gear 26 depresses the plunger 4-3, as shown in FIGURE 3, the limit switch is closed. However, whenever the tailgate window 14 is lowered, or opened, the end 46 of the sector gear 26 is disengaged from the plunger 43 thus opening the limit switch 58. The function oithe limit switch t; will be pointed out more particularly hereinafter.

The wiper unit for the tailgate window comprises a unidirectional direct current electric motor 52 connected through a suitable gear reduction to 'a rotatable crank arm 5'4. The motor 52 and gear reduction are suitably mounted between the inner and outer panels ot the tailgate The crank arm 54 is pivotally connected to one end of a drive link 55, the other end of which is pivotally connected to a second crank arm 53. Referring to PEG- URE 4, the crank arm 53 is integral with a sprocket wheel 69 journalled on a sleeve bearing 62. The sleeve bearing 62 is supported on a bushing dd carried by a bolt 66 which interconnects parts 68 and '79 constituting a transmission housing. The transmission housing is attached to the tailgate 1% by a plurality of bolts, not shown, having threaded engagement with the housing part iii.

A rockshaft 72 is journalled in the transmission housing by spaced sleeve bearings 74 and '76, the sleeve bearing 76 being carried by a closure plate 73. A second sprocket wheel 80 is press fitted on a knurled portion 82 of the rockshaft 72 so as to be drivingly connected therewith. The sprocket wheels 8d and as are connected by a chain $4, the sprocket wheel 6% having a greater pitch diameter and number of teeth than the pitch diameter and number of teeth on the sprocket wheel 8% so as to amplify the movement imparted to the rockshaft '72 from the crank arm 58.

Thus, during rotation of the crank 54, the link 55 will have to and fro movement imparted thereto so as to oscillate the crank arm 58 and sprocket wheel on through out an angle of substantially 90. The ratio of the pitch diameter of the sprocket wheels so andfiil is selected to increase the oscillatory movement imparted to the rockshaft '72 to an angle of at least 166 so as to clear an adequate area of the tailgate window 14. To this end, the rockshaft '72 has a serrated spindle 86 attached to its outer end for driving engagement with a mounted section 88 of a wiper arm 9%. The wiper arm 90 includes a blade carrying section 92 which is hinged to the mounting section 88 by a transversely extending pin 94 and biased towards the tailgate window 14 by an extension spring 96. The wiper arm 9i? carries a flexible wiper blade assembly 98 adapted to engage the outer surface of the tailgate window 14.

As shown in FIGURES l and 3, the transmission housing is mounted centrally of the tailgate such that the axis of the rockshaft for oscillating the wiper arm and blade assembly, or cleaner assembly, coincides with the center line of the vehicle. The stroke of the wiper blade 8 extends through an angle A, from a substantially horizontal parked position whereat the wiper blade engages the upper edge of the tailgate it) to an outboard stroke end position B. Thus, substantial portions of the window M are cleaned on both sides of the center line of the vehicle.

The washer unit for the tailgate window 14 comprises a liquid solvent reservoir 1% preferably mounted in the spare tire compartment of the vehicle. The reservoir 1. 39 is closed by a cover M92 which carries an electric motor 194. The motor 194 is connected to a centrifugal pump disposed within a measuring chamber within the reservoir and is designed to discharge a measured quantity of liquid solvent upon energization ofthe electric motor 104, after which the motor 10-4 is automatically deenergized by a pressure responsive sw'tch. The washer unit delivers liquid solvent to a conduit 1% concealed within the pillar l3 and the roof 16 connected to a nozzle 168 mounted centrally on the roof to for spraying iquid onto the window 14 into the path of movement or" the wiper blade 98.

With reference to for the wiperunit and the washer unit will be described. The wiper motor 52 includes an armature 11%) and a shunt field winding 112, one terminal of the armature alt) FIGURE 2, the energizing circuits eing connected to ground through a thermal overload circuit breaker 114. The other terminal of the armature is connected to a wire 116 through movable contact 118 of the limit switch 5* The movable contact 118 is shown carried by a leaf spring 12% which is inherently biased away from the fixed contact 122. The wire 11% is also connected to a leaf spring carried parking switch contact 224- which is engageable with a second leaf sprin carried cyclically actuated parking switch contact H6. The parking switch contact 126 is connected to one terminal of a battery the other terminal of which is grounded.

The plunger $8 is shown in engagement with the sector gear 2-6 for maintaining the limit switch contacts 113 and 122 in the closed position, thus indicating that the tailgate :indow 14 is substantially fully closed. The stationaly contact 122, to the limit switch is connected in series with a movable contact 13% of a manual wiper control switch 7 having a stationary contact 132 connected by wire 134 to the battery 128.

The washer unit motor l d-t includes an armature E36 and a shunt field winding 133, one terminal of the armature 135 being connected by a wire 14% with the wire 116. The other terminal of the armature 135 is connected to a stationary switch contact 14 2 of a push button washer switch including a bridging contact Ed t. The other stationary contact 146 of the washer switch is connected to ground. The washer control switch is shunted by a pressure responsive switch 148.

The manual wiper and washer control switch is preferably of the type disclosed in Ziegler Patent No. 2,995,962 such that the push button contact 144 includes a oneway driving connection with the movable contact 1353 of the wiper switch so as to automatically close the wiper switch concurrently with closure of the washer switch. When the push button contact 144 is released, the manual wiper switch remains closed until the contact 13a is manually opened. By using this type of switch arrangement, operation of the wiper unit is automatically coordinated with that of the washer unit.

When the tailgate window 14 is fully or substantially fully closed, the limit switch St? is closed thereby enabling the energizing circuits to both the wiper unit and the washer unit to be completed. Thus, upon movement of the manual wiper switch contact 1343 into engagement with switch contact 13 2, the wiper motor 52 will be energized from the battery 123 through wire 134, contacts 132 and 130, contacts 122 and lid of the limit switch 56, and Wire 116. The wiper motor 52 will impart oscillatory movement to the wiper blade 98 between its substantially horizontal parked position and its outboard end position B. It the tailgate window 14 is lowered during operation of the wiper motor 52, the sector gear 26 will move away from the plunger 48 thus opening the limit switch 50. The wiper motor 52 will be automatically deenergized when the wiper blade 93 arrives at its parked position due to operation of the automatic parking switch contacts 124 and 1-26 which are actuated by a wiper motor driven cam 15%. The energizing circuit to the wiper motor 52 will remain open irrespective of the manual control switch until the tailgate window 14 is moved to the fully or substantially fully closed position whereat the limit switch 5% will be closed.

To initiate a conjoint cycle of operation of the wiper unit and the washer unit, the push button switch contact M4 is momentarily depressed, and if the window 14 is fully closed, the washer motor 1'34- will be energized, and delivery or" liquid solvent will. close the pressure switch 14% until the measured volume of liquid solvent has been discharged from the reservoir 1%. Concurrently with closing the push button switch 14d, the wiper unit will be energized by closure of the manual control switch so as to clean the window 14 by simultaneously spraying liquid solvent thereonto during movement of the wiper blade 98 thereacross. If, during such a cycle of conjoint operation, the tailgate window 14 is lowered so as to open limit switch St the washer motor 104 will be deenergized, as will the Wiper motor 52 when the blade 98 arrives at its parked position.

Referring to FIGURE 5, the wiper blade 98 is shown in its parked position with the tailgate window 14 fully lowered. The wiper blade 98 is shown including a squeegee 152 carried by a flexible backing strip 154, the backing strip being carried by a pressure applying superstructure 155 comprising a plurality of pivotally interconnected yokes and levers for applying wiper arm pressure to the backing strip 154 and the squeegee 152. A clamp 158 embraces the marginal edges of the side rails of the medial portion of the backing strip 154. A retaining clip 16% is attached to the clamp 158, the retaining clip having a return bend portion 162 for gripping the outer belt weather seal 164 attached to the tailgate 10. The function of the detaining clip 16% is to prevent the wiper blade 98 from moving above the bead 22 on the upper edge of the tailgate window 14 when the window is in its fully lowered position as seen in FEGURE 5, and the tailgate is dropped to its horizontal position.

Referring to FIGURES 6 through 9, a second embodiment of a wiper unit for cleaning a tailgate Window will be described. In this embodiment the window regulating mechanism is identical with that previously described and thus includes sector gears 24 and 26 having arms 2 and 36, respectively engageable with the lower sash channel earns 32 of the window frame. The sector gear 25 is driven by a pinion gear 42 through a gear reduction unit from a reversible electric motor 44. However, in this embodiment as shown particularly in FIGURE 8, the tailgate window 14 has an exposed edge, and to protect this exposed edge the inner garnish molding 173 is elevated, or raised, such that the garnish molding 176 projects above t. e edge of the tailgate window 14 when it is in its fully lowered position.

The wiper motor 52 may be identical with the motor of the first embodiment and thus includes a rotary crank arm 54 pivotally connected to the inner end of a drive link 172. The outer end of the drive link 1712 is formed with an integral cam 174 and is pivotally connected by a pin 176 to a second link 178. The pin 176 is rigidly attached to the outer end of link 172. The second link 1753 is pivotally connected to the crank arm 58 of the wiper transmission assembly. Links 172 and 174 are normally maintained in straight line relation with respect to each other by a torsion spring 184 having one end attached to the pin 17o, the intermediate portion encircling the pin 176 and the other end overhanging the edge of the link .5715.

The crank arm 58 is connected to the rockshaft for the wiper arm fill which carri s wiper blade 98 through a chain and sprocket-type movement amplifying transmission as in the first embodiment. However, the ratio of the pitch diameter or" the sprocket wheels in the embodiment shown in FlGURES 6 through 9 will be slightly less than that in the first embodiment such that during rotation of the crank arm 54 so as to impart to and fro movement to the links 1172 and 173, the wiper blade and arm are moved throughout an angle C which is slightly less than the angle A of the first embodiment. Moreover, the normal stroke of the blade and arm assembly of the second embodiment is such that both stroke end positions D and E are angularly displaced from the horizontal.

he normal park position of the wiper blade and arm assembly in the embodiment shown in FIGURES 6 through 9 when the window 1 is fully raised is indicated by the line D from which it may be seen that the blade does not engage the upper edge of the tailgate 19. However, when the window is is fully lowered as shown in FIGURE 7, the upper edge of the sector gear 24 engages the cam 274 of the link 172 thereby effecting relative pivotal movement between the links 172 and against the bias of the torsion spring 13"!) thus shortening the efiective length of the linkage between the motor driven crank arm 54 and the transmission assembly crank arm 58 so as to impart further clockwise movement to the wiper arm and blade assembly through the angle E whereat it is in firm engagement with the upper edge of the tailgate ll) as shown in FIG- URES 7 and 8. In this depressed parked position the wiper blade d8 engages the exposed edge of the tailgate window 14 and is positively retained in this parked position by the linkage 172 and 178 so as to prevent the Wiper blade and arm assembly from moving above the glass 14 when the tailgate Elli is dropped to a substantially horizontal position.

The energizing circuit for the wiper unit of the second embodiment is identical to that described in conjunction with the first embodiment. Moreover, it is to be understood that the wiper unit of the second embodiment can be operated conjointly with a washer unit in precisely the same manner as the wiper unit or" the first embodiment.

While the embodiments of the invention as herein disclosed constitute preferred forms, it is to be understood that other forms might be adopted.

What is claimed is as follows:

1. In a vehicle having a tailgate swingable about a horizontal axis between substantially vertical and horizonal positions and carrying a window capable of being raised and lowered when the tailgate is in said substantially vertical position, means for raising and lowering said window including a sector gear, a Wiper unit for said window comprising a wiper motor mounted in said tailgate, a rockshaft supported in said tailgate adjacent the upper edge thereof, drive means interconnecting said motor and said rockshaft for imparting oscillation thereto, and a wiper blade and arm assembly attached to said rockshaft for oscillation across the outer surface of said window between predetermined stroke end positions, a manual control for said wiper motor, and auxiliary control means for said wiper motor actuated by said sector gear for automatically deactivating said wiper motor to arrest movement of said wiper blade and arm assembly at one of its stroke end positions when the window is lowered.

2. In a vehicle having a tailgate swingable about a horizontal axis between substantially vertical and horizontal positions and carrying a window capable of being raised and lowered when the tailgate is in said subantially vertical position, linkage means for naising and lowering said window, a wiper unit for said window comprising a wiper motor and a wiper blade and arm assembly oscillatable by said motor across said window between predetermined stroke end positions, a manual control for said wiper motor, and auxiliary control means for said wiper motor actuated by said linkage means for automatically deactivating said wiper motor to arrest movement of said wiper blade and arm assembly at one of its stroke end positions when the window is lowered.

3. In a vehicie having a tail-gate swingable about a horizontal axis between substantially vertical and horizontal positions and carrying a window capable of being raised and lowered when the tailgate is in said substantially vertical position, linkage means for raising and lowering said window, a wiper unit for said window counpr' 1g an electric wiper motor and a wiper blade and arm assembly oscill'atable by said wiper motor between predetermined stroke end positions, an energizing circuit for said electric wiper motor including a manual control switch for completing the energizing circuit to said motor and a wiper motor operated parking switch for interrupting the energizing circuit for said motor so as to arrest movement of said Wiper blade and arm assembly at one of said stroke end positions, and a limit switch connected in series with said manual control switch and actuated by said linkage means vfor intertion for gripping said outer 7 rupting said energizing circuit when the window is lowered.

4. In a vehicle having a tailgate swingable about a horizontal axis be ween substantially vertical and horizontal positions and carrying a window capable of being raised and lowered when the tailgate is in said substantially vertical position, linkage means for raising and lowering said window, a wiper unit for said window ineluding an electric wiper motor and a wiper blade and arm assembly osc'llatable by said wiper motor across the outer surface of said window between predetermined stroke end positions, a washer unit for said window cornprising electric washer motor for driving a pump and nozzle for spraying liquid solvent onto said window into the path of movement of said blade and arm assembly, an energizing circuit for said wiper motor including a control switch and a wiper motor operated parking switch for automatically deenergizing said wiper motor when the blade and arm assembly arrives at one of said stroke end positions, an energizing circuit for said washer pump motor including a second manual control switch, and a limit switch con 'neeted in both of said energizing circuits and actuated by said linkage means for automatically interrupting said circuits when the window is lowered.

5. In a vehicle having a tailgate swingable about a horizontal axis between substantially vertical and horizontal positions and carrying a window capable of being raised and lowered when the tailgate is in said sub stantially vertical position, actuating means or raising and lowering said window including a pair of interengaging sector gears, a wiper unit for said window comprising an electric wiper m tor mounted in said tailgate, a rockshaft supported in said tailgate adjacent the upper edge thereof, linkage means interconnecting said wiper motor and said roekshaft [for imparting oscillation thereto and a wiper blade and arm assembly attaehed to said rockshaft for oscillation across the outer surface of said window between predetermined stroke end positions, an energizing circuit for said wiper motor including a manual control switch for completing th energizing circuit and a wiper motor operated parking switch for automatically interrupting said energizing circuit and arresting movement of said blade and arm assembly at one of said predetermined stroke end positions, and a limit switch connected in series with said manual switch and actuated by one of said sector gears for automatically interrupting said energizing circuit when the window is lowered to cause said parking switch to arrest movement of said wiper blade and arm assembly at said one stroke end position.

6. The combination set forth in claim 5 wherein said window projects above the upper edge of said tailgate in its fully lowered position, and wherein said wiper blade and arm assembly engages the upper edge of said tailgate and is substantially horizontal at said one stroke end position.

7. The combination set tailgate includes an outer belt Weather seal, and wherein said wiper blade and arm assembly includes a retaining clip engageable with said outer belt weather seal when said wiper blade and arm assembly is in said one stroke end position in engagement with the upper edge of said tailgate.

8. The combination set forth in claim 7 wherein said retaining clip is disposed between said window and said outer belt weather seal when the Wiper blade md arm assembly is in engagement with the upper edge of said tailgate, and wherein said clip has a. return bend porbelt weather seal.

9. The combination set forth in claim v5 wherein the edge of said window projects above the upper edge of said tailgate when fully lowered, and wherein said tailgate includes an interior garnish molding which projects upwardly above the edge of said window.

forth in claim 6 wherein said for automatically adjusting the length of 10. In a vehicle having a tailgate swingable about a horizontal axis between substantially vertical and horizontal positions and carrying a window capable of being raised and lowered when the tailgate is in said substantially vertical position, actuating means for raising and lowering said window including :a pair of interengaging sector gears, a wiper unit for said window comprising a motor mounted in said tailgate, a roekshaft supported in said tailgate adjacent the upper edge thereof, adjustable length linkage means interconnecting said motor and said rockshaft for imparting oscillation thereto and a wiper blade and arm assembly attached to said rockshaft for oscillation across the outer surface of said window between predetermined stroke end positions, a manual control for said wiper motor, auxiliary control means actuated by one of said sector gears for automatically deactivating said wiper \motor to arrest movement of said wiper blade and arm assembly at one of said stroke end positions when the window is lowered, and means said linkage means to move said wiper blade and arm assembly to a depressed parked position in firm engagement with the upper edge of said tailgate and for retaining said wiper blade and arm assembly in said depressed parked position when said window is fully lowered.

11. In a vehicle having a tailgate swingable about a horizontal axis between substantially vertical and horizontal positions 'md carrying a window capable of being raised and lowered when the tailgate is in said substantially vertical position, actuating means for raising and lowering said window including a pair of interengaging sector gears, a wiper unit for said window comprising an electric motor mounted in said tailgate, a rockshaft supported in said tailgate adjacent the upper edge thereof, adjustable length linkage means interconnecting said motor and said rockshaft for imparting oscillation thereto and a wiper arm and blade assembly attached to said rockshaft for oscillation across the outer surf-ace of said window bet-ween predetermined stroke end positions, an energizing circuit for said wiper motor including a manual control switch and a motor operated parking switch for arresting movement of said wiper blade and arm assembly at one oi said stroke end positions, and means including one of said sector gears for automatically adjusting the length of said linkage means to move said wiper blade and arm assembly to a. depressed park position in engagement with the upper edge of said tailgate and retain the blade and arm assembly in said depressed park position when the window is fully lowered.

12. In a vehicle having a tailgate swingable about a horizontal axis between substantially vertical and horizontal positions and carrying a window capable of being raised and lowered when the tailgate is in said substantislly vertical position, actuating means for raising and lowering said window lneluding a pair of interengaging sector gears, a wiper unit comprising an electric wiper motor mounted in said tailgate, a rockshaft supported in said tailgate adjacent the upper edge thereof, adjustable length linkage and said rockshaft for imparting oscillation thereto and a wiper blade and arm assembly attached to said rockshaft for oscillation across the outer surface of said windowbetween predetermined stroke end positions, an energizing circuit for said wiper motor including a manual control switch and a motor operated parking switch for arresting movement of said wiper blade and arm assembly at one of said stroke end positions, a limit switch connected to said energizing circuit and actuated by one of said sector gears for automatically interrupting said ener gizing circuit when cluding the other of said sector gears for adjusting the length of said linkage means to move said wiper blade and arm assembly to a depressed parked position in finm engagement with the upper edge of said tailgate when.

the window is fully lowered.

means interconnecting said wiper motor the window is lowered, and means in-' 13. The combination set forth in claim 12 wherein said adjustable length linkage means comprises a pair of pivotally interconnected links, and resilient means for normally maintaining said links in axial alignment with each other.

14. The combination set forth in claim 13 wherein one of said links includes a cam, and wherein said other sector gear is engageable with said cam when the Window is fully lowered so as to effect pivotal movement of said References Cited in the file of this patent UNITED STATES PATENTS Zeigler et a1. Nov. 9, 1943 Ziegler Sept. 29, 1959 

1. IN A VEHICLE HAVING A TAILGATE SWINGABLE ABOUT A HORIZONTAL AXIS BETWEEN SUBSTANTIALLY VERTICAL AND HORIZONAL POSITIONS AND CARRYING A WINDOW CAPABLE OF BEING RAISED AND LOWERED WHEN THE TAILGATE IS IN SAID SUBSTANTIALLY VERTICAL POSITION, MEANS FOR RAISING AND LOWERING SAID WINDOW INCLUDING A SECTOR GEAR, A WIPER UNIT FOR SAID WINDOW COMPRISING A WIPER MOTOR MOUNTED IN SAID TAILGATE, A ROCKSHAFT SUPPORTED IN SAID TAILGATE ADJACENT THE UPPER EDGE THEREOF, DRIVE MEANS INTERCONNECTING SAID MOTOR AND SAID ROCKSHAFT FOR IMPARTING OSCILLATION THERETO, AND A WIPER BLADE AND ARM ASSEMBLY ATTACHED TO SAID ROCKSHAFT FOR OSCILLATION ACROSS THE OUTER SURFACE OF SAID WINDOW BETWEEN PREDETERMINED STROKE END POSITIONS, A MANUAL CONTROL FOR SAID WIPER MOTOR, AND AUXILIARY CONTROL MEANS FOR SAID WIPER MOTOR ACTUATED BY SAID SECTOR GEAR FOR AUTOMATICALLY DEACTIVATING SAID WIPER MOTOR TO ARREST MOVEMENT OF SAID WIPER BLADE AND ARM ASSEMBLY AT ONE OF ITS STROKE END POSITIONS WHEN THE WINDOW IS LOWERED. 